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Inbreeding effect on male and female fertility and inheritance of male sterility in Nemophila menziesii (Hydrophyllaceae)¹

University of Minnesota, Department of Ecology Evolution and Behavior, 100 Ecology, 1987 Upper Buford Circle, St. Paul, Minnesota 55108 USA

ABSTRACT

Models of the evolution of gynodioecy assume that inbreeding affects male and female fertility equally and ignore quantitative variation in sex expression. The objectives of this study were to assess inbreeding effects, genetic background, and plant maturity on male and female fertility and the mechanism of male sterility inheritance for Nemophila menziesii (Hydrophyllaceae). Frequency of male-sterile flowers, number of anthers and ovules, and percentage of viable pollen were measured on plants from different pedigrees and five inbreeding levels (F = 0, 0.0625, 0.25, 0.5, and 0.75). Quantitative variation in male sterility was evident. As inbreeding increased, anther and ovule number decreased; the effect on anther number was greater than on ovule number. Pedigrees varied in number of male-sterile flowers and inbreeding effects. Frequency of male-sterile flowers was greatest among first flowers. No trade-off between male and female fertility was detected. A model attributing male sterility to a cytoplasmic locus and restoration to male fertility to a nuclear locus accounted for the distribution of complete sterility and hermaphroditism over the pedigrees. This study suggests that models of the evolution and maintenance of gynodioecy should allow for quantitative variation in male and female fertility components due to inbreeding, pedigree, and plant maturity.

Key Words: cytoplasmic male sterility • gynodioecy • Hydrophyllaceae • partial male sterility • plant gender • qualitative variation • sex determination • vestigial anther

This article has been cited by other articles:

				D. E. McCauley and M. F. Bailey Recent advances in the study of gynodioecy: the interface of theory and empiricism Ann. Bot., June 10, 2009; (2009) mcp141v1. [Abstract] [Full Text] [PDF]